Skin care compositions having cyclic diesters and methods thereof

Abstract

The present invention generally relates to topical skin care compositions having at least one cyclic diester. More specifically, the present invention relates to novel topical skin care compositions having at least one cyclic diester of an alpha hydroxy acid, and at least one polar non-aqueous solvent.

Description

FIELD OF THE INVENTION[0001]The present invention generally relates to topical skin care compositions having at least one cyclic diester. More specifically, the present invention relates to novel topical skin care compositions having at least one cyclic diester of an alpha hydroxy acid, and at least one polar non-aqueous solvent.BACKGROUND OF THE INVENTION[0002]Alpha hydroxy acids (“AHAs”) are known to be useful in skin care compositions for treating various skin conditions, including rhytids (i.e., wrinkles), xeroderma (i.e., dry skin), hyperkeratosis, ichthyosis, and discoloration. Specifically, AHAs that are short chain carboxylic acids, such as glycolic acid and lactic acid, are preferred in cosmetic compositions due to the AHAs ability to penetrate skin. In particular, the bioavailability of short chain AHAs stimulates cellular activity in the epidermis and dermis, as well as increases desquamation of the outer layers of the epidermis to help alleviate and treat the skin condit...

AI Technical Summary

Benefits of technology

The present invention is related to new skin care compositions comprising a combination of ingredients. The compositions have low amounts of water and consist of a cyclic diester of an alpha hydroxy acid, a polar non-aqueous solvent, and an aliphatic base. The compositions have unique properties that make them effective in providing skin care benefits. The invention also includes a process for producing the new skin care compositions.

Problems solved by technology

However, a major problem with using AHAs in skin care compositions is the fact that AHAs are acids, which can lead to skin irritation.

And while using AHAs for their acidic properties may be desirable in certain applications, such as for skin peel applications, the acidity of AHAs can have detrimental and undesirable effects for more daily and routine applications.

However, not only do these compositions require an additional component, such as amino acids and imidazoline compounds, which may not be desirable for a particular composition or use, but this strategy also does not address the underlying issue regarding the acidity of the AHAs.

By not addressing the problematic acidity of the AHAs, skin irritation and intolerability can persist, especially in users with sensitive skin.

In addition to problems associated with the acidity of AHAs, skin care compositions in the field generally have problems sustaining relatively long-term stability, while also allowing sufficient penetration of the active ingredient into the skin.

Stability problems can occur based on a variety of environmental factors, including changes in temperature and humidity during processing, shipping, storage, and use, as well as chemical factors within the compositions, including the miscibility or homogeneity of the various components.

In this respect, less stable compositions can be more acidic and can potentially become more acidic over time due to masking components becoming diminished or separating out of the compositions, which further exacerbates the irritability of the compositions.

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